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Characterization of Ti–Al Intermetallic Synthesized by Mechanical Alloying Process
Manoj Kumar Yadav,Arshad Noor Siddiquee,Zahid A. Khan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
Mechanical alloying (MA) of Al60Ti40 (wt%) has been successfully done by using a planetary ball mill having mixed ballsof 5 mm and 15 mm diameter to refne the crystallite size of the elemental powder and to get the new MAed phase of AlTi. The microstructural and morphological analysis of elemental as well as the processed powder was done with help of ScanningElectron Microscope and X-Ray difraction technique. Mechanical alloying of elemental Al and Ti resulted in the formationof AlTi phases with the refection of α-Ti3Al and TiAl3. The average particle size was reduced around 7 times after 60 h ofmilling. The mean crystallite size of MAed powder was also reduced up to 85 nm after 60 h of mechanical alloying undercontrolled conditions.
Biomass and Carbon Storage Pattern in Natural and Plantation Forest Ecosystem of Chhattisgarh, India
Manoj Kumar Jhariya,Dhiraj Kumar Yadav 강원대학교 산림과학연구소 2018 Journal of Forest Science Vol.34 No.1
We studied natural and plantation forest ecosystem of Sarguja in Chhattisgarh, India in order to understand how vegetation biomass, carbon stock and its allocation patterns vary among the sites. For this, stratified random sampling was opted to measure the different layers of vegetation. Wide floral diversity was found in the natural forest site as compared to the teak stand. Overall, 17 tree species found in natural forest comprising 8 families while in the teak stand 6 species were recorded. In understory strata 23 species were recorded (18 herbs and 5 shrubs) in natural forest whereas in teak stand 20 herb species and 3 shrubs were found. Great variation was also seen in the population dynamics of the different vegetation stratum in concerned sites. The sapling, seedling and herb density was found to be highest in natural stand while tree and shrub density was more in teak stand. Results indicated that stand biomass of the natural site was 321.19 t ha-1 while in the teak stand it was 276.61 t ha-1. The total biomass of tree layer in plantation site was 245.22 t ha-1 and natural forest 241.44 t ha-1. The sapling, seedling, shrub and forest floor biomass was found highest under natural forest as compared to the teak plantation site. Carbon stock has similar trend as that of biomass accumulation in natural forest and teak stand. Higher biomass accumulation and carbon stock were recorded in the higher girth class gradation of the population structure. Proper efforts are required to manage these diverse ecosystems to obtain higher biomass and sustainable ecological services.
Critical aspects of impedance spectroscopy in silicon solar cell characterization: A review
Yadav, Pankaj,Pandey, Kavita,Bhatt, Vishwa,Kumar, Manoj,Kim, Joondong PERGAMON 2017 RENEWABLE AND SUSTAINABLE ENERGY REVIEWS Vol.76 No.-
<P><B>Abstract</B></P> <P>Solar energy generation and utilization is dominated by silicon based solar photovoltaic technology, which has a market share of 80–90% of the solar photovoltaic industry worldwide. The performance indicating parameters of silicon solar cells include power conversion efficiency, series and shunt resistance, ideality factor and built-in potential. These parameters are mostly characterized by DC techniques, which is limited by its insufficiency to identify other important parameters such as interfacial diffusion and transition capacitance and resistive and capacitive components of p-p<SUP>+</SUP> interface of a silicon solar cell. Impedance spectroscopy is considered to be one of the most promising techniques for the characterization of abovementioned performance limiting parameters of a solar cell. In order to address the decoupling of various physical processes associated with different interfaces of a solar cell, quantitative analysis of the impedance spectroscopic data is required. An appropriate mathematical model is frequently used to correlate with the physical performance limiting parameters. This review presents a complete overview of the required mathematical models to analyse impedance spectroscopic data for interfacial processes of silicon solar cell.</P>
Ram Yadav,Samarth Agarwal,Satyanarayan Sankhwar,Apul Goel,Manoj Kumar,Manmeet Singh,Ruchir Aeron,Vikas Kumar 대한비뇨의학회 2019 Investigative and Clinical Urology Vol.60 No.1
Purpose: A prospective study evaluating impact of percutaneous nephrolithotomy (PCNL) on renal function following PCNL using ethylenedicysteine (EC) renal scan. Does multiplicity of access tracts play a role?Materials and Methods: A prospective observational study was done and patients undergoing PCNL for renal calculi at our urology department were selected. Renal Tc99m EC scan was done pre-surgery and at 3 months follow-up. An assessment was done on decline in glomerular filtration rate (GFR) in postoperative period based on number of access tracts required. Results: A total of 110 patients were enrolled in the study. The total number of punctures was 170 with 141 being supra-costal puncture and 29 infra-costal. The total number of single punctures were 60 and classified as Group I whereas patients with double puncture and triple puncture (40 and 10 patients, respectively) were classified as Group II. Mean postoperative split renal function (in Tc99m EC scans) of patients of Group I (40.93±19.62%) was found to be higher than that of Group II (32.82±16.98%). Mean change (decline) in GFR for single, double and triple tracts were 2.68 mL/min, 3.80 mL/min, and 4.2 mL/min, respectively. Conclusions: PCNL used for stone removal can improve renal function by eradicating obstruction; however, this procedure may itself negatively impact the functions of the targeted kidney. Our study showed post PCNL decrease in GFR which worsens with an increasing number of accesses.
Biomass and Carbon Storage Pattern in Natural and Plantation Forest Ecosystem of Chhattisgarh, India
Jhariya, Manoj Kumar,Yadav, Dhiraj Kumar Institute of Forest Science 2018 Journal of Forest Science Vol.34 No.1
We studied natural and plantation forest ecosystem of Sarguja in Chhattisgarh, India in order to understand how vegetation biomass, carbon stock and its allocation patterns vary among the sites. For this, stratified random sampling was opted to measure the different layers of vegetation. Wide floral diversity was found in the natural forest site as compared to the teak stand. Overall, 17 tree species found in natural forest comprising 8 families while in the teak stand 6 species were recorded. In understory strata 23 species were recorded (18 herbs and 5 shrubs) in natural forest whereas in teak stand 20 herb species and 3 shrubs were found. Great variation was also seen in the population dynamics of the different vegetation stratum in concerned sites. The sapling, seedling and herb density was found to be highest in natural stand while tree and shrub density was more in teak stand. Results indicated that stand biomass of the natural site was $321.19t\;ha^{-1}$ while in the teak stand it was $276.61t\;ha^{-1}$. The total biomass of tree layer in plantation site was $245.22t\;ha^{-1}$ and natural forest $241.44t\;ha^{-1}$. The sapling, seedling, shrub and forest floor biomass was found highest under natural forest as compared to the teak plantation site. Carbon stock has similar trend as that of biomass accumulation in natural forest and teak stand. Higher biomass accumulation and carbon stock were recorded in the higher girth class gradation of the population structure. Proper efforts are required to manage these diverse ecosystems to obtain higher biomass and sustainable ecological services.
FIXED POINT THEOREMS FOR (ξ,β)-EXPANSIVE MAPPING IN G-METRIC SPACE USING CONTROL FUNCTION
Jyoti Yadav,Manoj Kumar,Reena,Mohammad Imdad,Sahil Arora 경남대학교 수학교육과 2021 Nonlinear Functional Analysis and Applications Vol.26 No.5
In this paper, some fixed point theorems for new type of (ξ,β)-expansive mappings of type (S) and type (T) using control function and β-admissible function in G-metric spaces are proved. Further, we prove certain fixed point results by relaxing the continuity condition.
Effects of Long-term Use of Depo-medroxyprogesterone Acetate on Lipid Metabolism in Nepalese Women
Binod Kumar Yadav,Rajesh Kumar Gupta,Prajwal Gyawali,Rojeet Shrestha,Bibek Poudel,Manoj Sigdel,Bharat Jha 대한진단검사의학회 2011 Annals of Laboratory Medicine Vol.31 No.2
Various synthetic progestogens that are used as contraceptives have been reported to influence lipid and lipoprotein fractions differently. Depo-medroxyprogesterone acetate (DMPA), a synthetic progestogen, is used by Nepalese women as a contraceptive agent. Our study aims to determine the effects of long-term use of DMPA on lipid metabolism. We performed this study on 60 healthy Nepalese women who had been using DMPA for more than 2 yr and age- and weight-matched control subjects who were not using hormonal contraceptives. Fasting blood samples were collected from the subjects for the estimation of total cholesterol (TC) and triglyceride (TG) levels, and the levels of high-density lipoprotein cholesterol (HDL-C) and low-density lipoprotein cholesterol (LDL-C) were estimated using the Friedewald’s equation. TC and LDL-C levels in DMPA users were significantly higher than those in non-users. Our study concluded that DMPA use induces lipid metabolism changes that can increase the risk of cardiovascular diseases.